feat: update documentation and styling, add language/theme switcher to menu

[Stensel8]

Summary

update documentation and styling, add language/theme switcher to menu

Type of change

• feat — new page or feature
• refactor — restructuring without content changes

PR title and commit types must follow these standards — view the contributing guide

Checklist

• PR title follows the commit convention (e.g. fix: correct nmcli command in eduroam guide)
• Both EN and NL versions updated (if applicable)
• Media is in AVIF format (not PNG/JPG)
• No broken image references (/images/*.avif all exist in static/images/)
• Tested locally with hugo server

[Copilot]

Pull request overview

This PR updates the Hugo/Hextra site UX and documentation presentation, including a new navbar language/theme control entry, refreshed landing-page copy, and improved readability of “Known Issues” pages.

Changes:

• Add Language + Theme items to the main menu and adjust theme-toggle visibility behavior.
• Refactor “Known Issues” (EN/NL) to use collapsible details sections.
• Refresh homepage copy/system-info presentation and add the system-info.avif asset.

Reviewed changes

Copilot reviewed 14 out of 16 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
static/images/system-info.avif	Adds the system info screenshot asset used on the homepage.
hugo.toml	Adds menu items for language/theme controls and changes theme toggle display behavior.
content/docs/virtualization/winboat.nl.md	Small NL doc polish (link label, alt text, references formatting).
content/docs/known-issues.nl.md	Converts active issues to collapsible details blocks (NL).
content/docs/known-issues.md	Converts active issues to collapsible details blocks (EN).
content/docs/getting-started.nl.md	Removes the duplicated hardware block from the NL getting started page.
content/docs/getting-started.md	Removes the duplicated hardware block from the EN getting started page.
content/docs/applications.nl.md	Minor sentence punctuation tweak for readability (NL).
content/docs/_index.nl.md	Updates docs landing page copy and feature-card subtitles (NL).
content/_index.nl.md	Updates NL homepage hero/callout, adds RAM row + Copilot note, uses system-info image.
content/_index.md	Updates EN homepage hero/callout, adds RAM row + Copilot note, uses system-info image.
assets/css/custom.css	Adds styling for the system-info image in light mode, hides duplicate language/theme controls, adjusts hero badge sizing.
.gitignore	Ignores Hugo module vendoring folder (/_vendor/).

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[Copilot]

The link text packages.cachyos.org/winboat doesn’t match the actual target URL (which points to /package/cachyos/x86_64/winboat). Consider using a descriptive label (e.g., “CachyOS package”) or making the displayed URL match the href to avoid confusion.

Suggested change

	Packagebron: [packages.cachyos.org/winboat](https://packages.cachyos.org/package/cachyos/x86_64/winboat)
	Packagebron: [CachyOS packagepagina](https://packages.cachyos.org/package/cachyos/x86_64/winboat)

[Copilot]

Inline styling (style="opacity: 0.45;") is the only style= usage in the content folder right now. For maintainability/theme consistency (especially across dark mode), it would be better to use existing Hextra utility classes or a named CSS class in assets/css/custom.css instead of inline styles.

Suggested change

	<small style="opacity: 0.45;">Some documentation on this site has been written or improved with assistance from GitHub Copilot.</small>
	<small class="copilot-note">Some documentation on this site has been written or improved with assistance from GitHub Copilot.</small>

[Copilot]

Inline styling (style="opacity: 0.45;") is the only style= usage in the content folder right now. For maintainability/theme consistency (especially across dark mode), it would be better to use existing Hextra utility classes or a named CSS class in assets/css/custom.css instead of inline styles.

Suggested change

	<small style="opacity: 0.45;">Een deel van de documentatie op deze site is geschreven of verbeterd met hulp van GitHub Copilot.</small>
	<small class="opacity-50">Een deel van de documentatie op deze site is geschreven of verbeterd met hulp van GitHub Copilot.</small>